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並前往https://www.reddit.com/r/learnjavascript/comments/5xsx5y/question_can_someone_tell_me_why_this_returns_null/

[Question] can someone tell me why this returns null. - Reddit

var file = files[0]; var reader = new FileReader(); reader.readAsText(file); reader.onload = function(e) { var rawLog = reader.result; console.log(rawLog); };}.

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